Water-tube boiler.



PATENTED APR. 21, 1908.

A. L. BIKER. WATER TUBE BOILER.

APPLICATION FILED JUNE 15 II I ,Alr

ZUiZt-raessas rm: mmms r-srzns co, WASHINGYDN, o. c,

UNITED STATE$EATENT @FFIGE.

ANDREW L. BIKER, OI BRIDGEPORT, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE WHITE COMPANY, OF CLEVELAND, OHIO.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented April 21, 1908.

Application filed June 15, 1903. Serial No. 161,414.

To all whom it may COYLCUNL.

Be it known that 1, ANDREW L. lriiu'in, a citizen of the United States, residing at Bridgeport, in the county of Fairlield, State of Connecticut, have invented an Improvo ment in aterllube Boilers, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention aims to produce a novel and improved steam boiler or generator of the water tube type.

The features of my invention will best be understood after a description of the best embodiment thereof now known to me.

In the accompanying drawings,-Figure 1, in side elevation, shows a boiler illustrating my invention; and, Fig. 2, a top or plan view thereof.

In the particular embodiment of my inven tion selected for illustration herein and shown in the drawing, my improved boiler is pro vided with a central vertical drum or column, a, to which are connected, top and bottom, the upper and lower ends of a plurality of spiral coils of tube or pipe, I), a, (Z, c. As here shown, the outermost coils are marked 1), and are three in number, the convolutions of the respective coils alternating one with another in vertical series, being thus intertwined or coiled much like a triple thread upon a screw.

Within the coils b, are the coils 0, also shown as three in number, likewise intertwined or coiled alternately in vertical series like the coils, Z); and in the same manner the coils d and c, of which there are three each, are similarly coiled and arranged. Thus, there are provided, practically speaking, the largest number of coils of the greatest length, and most compactly arranged, in a given compass or space, each coil connecting top and bottom with the central column. It will be noticed also that the pitch of the spirals of the several coils is such as to cause free and rapid circulation of the water and steam therethrough, which would not be possible if the same length of piping was attempted to be obtained in a fewer number of coils. The

coils also are free from joints, excepting top and bottom, where they enter or are joined to the central column.

The central column may be extended vertically above the topmost convolutions of the coils, far enough to obtain any desired steam space; but in any event, this central column furnishes a reserve power by reason of the water and steam which it contains, which gives to the boiler all the advantages of the lire tube boiler, coupled with the advantages of a water tube or spirally coiled boiler.

A suitable water column f is indicated at the left, Fig. 1, the same being connected top and bottom with the central column, a.

Any suitable casing may be employed to inclose the boiler as indicated in dotted lines.

Of course the number of concentrically arranged coils and the number of coils arranged in one or more vertical series may be varied as desired, according to the requirements and possibilities of each individual case; and preferably the outer coils of the greatest length and lowest pitch will be made larger than the inner coils, to maintain substantially uniform circulatory action throughout the said coils, I having in the drawings shown the coils as gradually graded or reduced in cross-sectional diameter from the outermost to the innermost concentric series for this purpose.

Obviously, my invention is not restricted to the particular embodiment thereof here shown and described, but may be widely varied within the spirit and scope of the invention.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent is 1. A boiler comprising a central column and a plurality of concentrically arranged groups of coils encircling said column and entering the same at varying heights at both their ends, said coils being of unequal inclination, and the tubes thereof increasing in di ameter inversely as the inclination.

2. A boiler comprising a central column and a plurality of concentrically arranged groups of coils, said coils at their ends entering said column at varying levels, the inclination of the coils and the diameter of the tubes varying inversely from the inner to the outer coils.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ANDREI/V L. BIKER.

Witnesses: 

